Rock-drill.



No.847,587. PATENTBD MAR. 19, 1907.l B. H. LOCKE.

ROCK DRILL.

APLlcA'r-Ion FILED 23.16, 190s.

Attest:

BRADFORD H. LOCKE,

ROCK-Dahl..

Specification of Letters Patent.

OF NEW YORK, N. Y.

Patented March 19, 1907.

Application led April 16; 1906. Serial No. 312,046.

To all whom t may concern:

Be it known that I, BRADFORD H. LOCKE, a citizen of the United States, at present residing in the borough of Manhattan of the city of New York, in the State of New York, have invented certain new and useful Improvements in RQck-Drills, of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof.

rIhis invention relates particularly to the construction of drills such as are employed in powerdriven maehines-such as electric drills, steam-drills, &c. and in which provisionis made for carying a stream of air or water through the rll stock to be discharged at or near the bottom of the hole being made by the drill for the purpose of stirring up and facilitating the ejection of the mud. Such drills lare commonly providedv with longitudinal axial bores or channels which terminate in or close to the drill-heads.

In sharpening a drill of this character such a hole is elosedand provision must be made for reopening it. Furthermore, it is found that such a hole is liable tc be plugged by a fragment of rock driven into it under the ae| tion of the drill, so that the passage 'of the stream of air or water under normal pressure is prevented.

It is the objectI of this invention to overcome the difficulties above referred to and to provide means for admitting the stream of water er air at a point suitably near the drillface which shall not be liable to be rendered inoperative by plugging in the manner described, shall not be cle-sed in the process of sharpening, and shall not require any attention except the removal of a plug during the life of the drill, nevithstanding successive sharpcnings.

In accordance with the invent-ion the drillstock is provided with a longitudinal channel, Which may or may not be axial, and such channel is further provided at suitable intervals along its length, back of the drill-head,

with lateral openings. All of such openings, except the one nearest the drill-face, are temiporarily plugged, s0 that the stream of air or Water issues from the opening nearest the drill-face, Where it will be found to perform its intended purpose quite as efficiently as i the channel terminated in the drill-face. As

one lateral hole after another is closed in successive sharpenings the plug is Withdrawn 55 from the next hole above and thef drill continues in operative condition without further attention.

The invention will be more fully explained hereinafter with reference to the accom- 6o panying drawings, in Which- Figure 1 is a view, partly in side elevation and partly in longitudinal section, of a drill constructed in accordance with the invention. Fig. 2 is a faceview of the drill, and 65 F ig. 3 is a transverse section in the plane indicated by the line 3 3 of Fig. 1.

The drill-stock a may be of any suitable size and of any desired cross-section. Its face or head c may be formed and sharp- 7o ened in any suitable manner: The drillstock is provided wit a longitudinal'channel (Ifwhich is connected at the extremity ofthe drill-stock or at anyH suitable point With-a supply of air or Water under such Amoderate 75 pressure as may be desirable for th purpose of stirring up and facilitating the discharge of the mud from the hole being drilled. This vchannel is shown in the present instance as substantially axial, and at fre uent intervals 8o along its length, back of the ill-head, it is provided with lateral holes or openings e e, ttc., the saine opening through the side of the drill-stock. rIhese holes are so placed that one of them shall be Within a short distance 8 5 .1f the spread ofthe drill occasioned by sharpening, and this particular opening is left free While the openings above it are plugged temporarily, preferably With small wcQXlen plugs f lightly driven in. Y 9o In the use of the improved drill the stream, of lir or Water issues from the hole ,c nearest to the drill-head c where, it is found, the issuing stream of air or Water acts With as much eliiciency in attaining the desired ob- 95 ject as if it issued axially in the face of the drill. If the hole e is closed When-the drill is resharpened, then the plugf is removed from the next hole, as c, and so on as thelength of the drill isgradually reduced in successive rc sharpenings.

Iclairn as my invention- Y 1. A rock-drill having a longitudinal channel and a series of lateral openings therefrom at frequent intervals along its length back of u the drill-head, whereby the drill can be suc- This specification signed and witnessed this l i 5th day of Arpril7 A. D. 1906.

BRADFORD H. LOCKE.

In presence 0f- THOMAS J. CANTY, LUCrUs E. VARNEY. 

